1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
4 * Copyright 2010 Tilera Corporation. All Rights Reserved.
5 * Copyright 2015 Regents of the University of California, Berkeley
7 * See asm-generic/syscall.h for descriptions of what we must do here.
10 #ifndef _ASM_RISCV_SYSCALL_H
11 #define _ASM_RISCV_SYSCALL_H
13 #include <asm/hwprobe.h>
14 #include <uapi/linux/audit.h>
15 #include <linux/sched.h>
16 #include <linux/err.h>
18 /* The array of function pointers for syscalls. */
19 extern void * const sys_call_table[];
20 extern void * const compat_sys_call_table[];
23 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
24 * This importantly ignores the high bits on 64-bit, so comparisons
25 * sign-extend the low 32 bits.
27 static inline int syscall_get_nr(struct task_struct *task,
33 static inline void syscall_rollback(struct task_struct *task,
36 regs->a0 = regs->orig_a0;
39 static inline long syscall_get_error(struct task_struct *task,
42 unsigned long error = regs->a0;
44 return IS_ERR_VALUE(error) ? error : 0;
47 static inline long syscall_get_return_value(struct task_struct *task,
53 static inline void syscall_set_return_value(struct task_struct *task,
57 regs->a0 = (long) error ?: val;
60 static inline void syscall_get_arguments(struct task_struct *task,
64 args[0] = regs->orig_a0;
66 memcpy(args, ®s->a1, 5 * sizeof(args[0]));
69 static inline int syscall_get_arch(struct task_struct *task)
72 return AUDIT_ARCH_RISCV64;
74 return AUDIT_ARCH_RISCV32;
78 typedef long (*syscall_t)(ulong, ulong, ulong, ulong, ulong, ulong, ulong);
79 static inline void syscall_handler(struct pt_regs *regs, ulong syscall)
84 if ((regs->status & SR_UXL) == SR_UXL_32)
85 fn = compat_sys_call_table[syscall];
88 fn = sys_call_table[syscall];
90 regs->a0 = fn(regs->orig_a0, regs->a1, regs->a2,
91 regs->a3, regs->a4, regs->a5, regs->a6);
94 static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
99 asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
101 asmlinkage long sys_riscv_hwprobe(struct riscv_hwprobe *, size_t, size_t,
102 unsigned long *, unsigned int);
103 #endif /* _ASM_RISCV_SYSCALL_H */